ceph: support getting ceph.dir.pin vxattr

Link: http://tracker.ceph.com/issues/37576
Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

5 files changed, 32 insertions, 1 deletions

diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 7f82ceff510a..e6012de58aae 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -877,6 +877,7 @@ static int fill_inode(struct inode *inode, struct page *locked_page,
                         ci->i_rbytes = le64_to_cpu(info->rbytes);
                         ci->i_rfiles = le64_to_cpu(info->rfiles);
                         ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
+                        ci->i_dir_pin = iinfo->dir_pin;
                         ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
                 }
         }
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index e87544e42488..ddfb6a45575b 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -157,6 +157,13 @@ static int parse_reply_info_in(void **p, void *end,
                         ceph_decode_64_safe(p, end, change_attr, bad);
                 }
 
+                /* dir pin */
+                if (struct_v >= 2) {
+                        ceph_decode_32_safe(p, end, info->dir_pin, bad);
+                } else {
+                        info->dir_pin = -ENODATA;
+                }
+
                 *p = end;
         } else {
                 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
@@ -187,6 +194,8 @@ static int parse_reply_info_in(void **p, void *end,
                                 *p += info->pool_ns_len;
                         }
                 }
+
+                info->dir_pin = -ENODATA;
         }
         return 0;
 bad:
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index 0919aacc1af3..af3b25e59e90 100644
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -68,6 +68,7 @@ struct ceph_mds_reply_info_in {
         char *pool_ns_data;
         u64 max_bytes;
         u64 max_files;
+        s32 dir_pin;
 };
 
 struct ceph_mds_reply_dir_entry {
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 5b15ae91024a..df44a7761472 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -318,6 +318,8 @@ struct ceph_inode_info {
         /* quotas */
         u64 i_max_bytes, i_max_files;
 
+        s32 i_dir_pin;
+
         struct rb_root i_fragtree;
         int i_fragtree_nsplits;
         struct mutex i_fragtree_mutex;
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 316f6ad10644..0cc42c8879e9 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -228,8 +228,19 @@ static size_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val,
                         ci->i_rctime.tv_nsec);
 }
 
-/* quotas */
+/* dir pin */
+static bool ceph_vxattrcb_dir_pin_exists(struct ceph_inode_info *ci)
+{
+        return ci->i_dir_pin != -ENODATA;
+}
+
+static size_t ceph_vxattrcb_dir_pin(struct ceph_inode_info *ci, char *val,
+                                    size_t size)
+{
+        return snprintf(val, size, "%d", (int)ci->i_dir_pin);
+}
 
+/* quotas */
 static bool ceph_vxattrcb_quota_exists(struct ceph_inode_info *ci)
 {
         bool ret = false;
@@ -315,6 +326,13 @@ static struct ceph_vxattr ceph_dir_vxattrs[] = {
         XATTR_RSTAT_FIELD(dir, rbytes),
         XATTR_RSTAT_FIELD(dir, rctime),
         {
+                .name = "ceph.dir.pin",
+                .name_size = sizeof("ceph.dir_pin"),
+                .getxattr_cb = ceph_vxattrcb_dir_pin,
+                .exists_cb = ceph_vxattrcb_dir_pin_exists,
+                .flags = VXATTR_FLAG_HIDDEN,
+        },
+        {
                 .name = "ceph.quota",
                 .name_size = sizeof("ceph.quota"),
                 .getxattr_cb = ceph_vxattrcb_quota,